The Attack Rate Is

The attack rate is:

A) number of persons who ate a specific food and became ill / total number of persons who ate the specific food
B) total number of persons who ate a specific food / number of persons who did not become ill
C) similar to the incidence rate of a disease of short duration.
D) the same as the secular trend.
E) similar to the incidence rate of a disease of short duration as well as number of persons who ate a specific food and became ill / total number of persons who ate the specific food